# Science Olympiad Test: Light- 1

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## 10 Questions MCQ Test Science Olympiad for Class 10 | Science Olympiad Test: Light- 1

Science Olympiad Test: Light- 1 for Class 10 2022 is part of Science Olympiad for Class 10 preparation. The Science Olympiad Test: Light- 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Science Olympiad Test: Light- 1 MCQs are made for Class 10 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Science Olympiad Test: Light- 1 below.
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Science Olympiad Test: Light- 1 - Question 1

### The image formed by a concave mirror is found to be virtual, erect and enlarged. Where should the object be placed?

Detailed Solution for Science Olympiad Test: Light- 1 - Question 1

A concave mirror has a reflective surface that is curved inward and away from the light source. Concave mirrors reflect light inward to one focal point. Unlike convex mirrors, the image formed by a concave mirror shows different image types depending on the distance between the object and the mirror.

Science Olympiad Test: Light- 1 - Question 2

### A ray of light falls on a plane mirror making an angle of 30° with the mirror. On reflection, the ray deviates through an angle of

Detailed Solution for Science Olympiad Test: Light- 1 - Question 2

∠AON = i = 30° = r = ∠ NOB
Ray AA´ deviates such that angle of

Deviation ∠ A´OB = 180° – 30° – 30° = 120°

Science Olympiad Test: Light- 1 - Question 3

### The linear magnification produced by concave mirror is always positive. This is because

Detailed Solution for Science Olympiad Test: Light- 1 - Question 3

m = -v/u. For a convex mirror, v is –ive, thus m becomes positive.

Science Olympiad Test: Light- 1 - Question 4

When two or more than two rays starting from a point on the object, after refraction through a lens, do not actually meet but appear to diverge from point, the image formed is

Detailed Solution for Science Olympiad Test: Light- 1 - Question 4
• Real Images are images which can be obtained on the screen. They are formed when light rays after getting reflected from a mirror actually meet at a point.
• Virtual Images are images which can only be seen in a mirror but cannot be obtained on the screen. They are formed when light rays after getting reflected from a mirror appear to meet at a point.
Science Olympiad Test: Light- 1 - Question 5

A concave mirror produces an image of 20 cm height which is five times magnified. The height of the object is

Detailed Solution for Science Olympiad Test: Light- 1 - Question 5

Given that u = - 20 cm and m = - 5

- 20 = - v/-5
v = - 4
Thus, the height of the object is 4 cm.

Science Olympiad Test: Light- 1 - Question 6

The linear magnification of a convex mirror of focal length 15 cm is 1/3. The distance of the object from the mirror is

Detailed Solution for Science Olympiad Test: Light- 1 - Question 6

u = – 2 f
= – 2 × 15
= – 30 cm

Science Olympiad Test: Light- 1 - Question 7

The power of a convex lens P1 is equal to 4 D, which is placed in close contact with a concave lens having power P2 equal to – 10 D. What will be the power of the combination of the two lenses?

Detailed Solution for Science Olympiad Test: Light- 1 - Question 7

P = P1 + P2 = 4 D + (– 10 D) = – 6 D

Science Olympiad Test: Light- 1 - Question 8

The image of a small electric bulb fixed on the wall of a room is to be obtained, on the opposite wall 3 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?

Detailed Solution for Science Olympiad Test: Light- 1 - Question 8

u + v = 3 m (given)
As maximum distance between an object and image in case of a convex lens = 4 f
4 f = 3 m ⇒ f = 3/4 m = 0.75 m

Science Olympiad Test: Light- 1 - Question 9

The linear magnification of a convex lens is – 1 when object in front of the lens is

Detailed Solution for Science Olympiad Test: Light- 1 - Question 9

In a convex lens, when object is in front of the lens at 2 F1, an inverted image of size of object (h2 = h1) is formed at 2F2. Therefore, m = – 1.

Science Olympiad Test: Light- 1 - Question 10

If a glass is placed in a liquid of refractive index that is equal to glass, it will

Detailed Solution for Science Olympiad Test: Light- 1 - Question 10

The refractive index of liquid must be greater than or equal to 1.5 in order to make the lens disappear.

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